Search for single production of a vector-like T quark decaying to a Z boson and a top quark in proton-proton collisions at √𝑠 = 13 TeV

Open access
Author
CMS Collaboration
Sirunyan, Albert M.
Bachmair, Felix
Bäni, Lukas
Berger, Pirmin
Bianchini, Lorenzo
Casal, Bruno
Dissertori, Günther
Dittmar, Michael
Donegà, Mauro
Grab, Christoph
Heidegger, Constantin
Hits, Dmitry
Hoss, Jan
Kasieczka, Gregor
Klijnsma, Thomas
Lustermann, Werner
Mangano, Boris
Marionneau, Matthieu
Meinhard, Maren T.
Meister, Daniel
Micheli, Francesco
Musella, Pasquale
Nessi-Tedaldi, Francesca
Pandolfi, Francesco
Pata, Joosep
Pauss, Felicitas
Perrin, Gaël
Perrozzi, Luca
Quittnat, Milena
Reichmann, Michael
Schönenberger, Myriam
Shchutska, Lesya
Tavolaro, Vittorio R.
Theofilatos, Konstantinos
Vesterbacka Olsson, Minna L.
Wallny, Rainer
Zhu, De H.
et al.
Date
2018-01-10Type
- Journal Article
Citations
Cited 23 times in
Web of Science
Cited 23 times in
Scopus
ETH Bibliography
yes
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Abstract
A search is presented for single production of a vector-like quark (T) decaying to a Z boson and a top quark, with the Z boson decaying leptonically and the top quark decaying hadronically. The search uses data collected by the CMS experiment in proton–proton collisions at a center-of-mass energy of 13 TeV in 2016, corresponding to an integrated luminosity of 35.9 fb-1. The presence of forward jets is a particular characteristic of single production of vector-like quarks that is used in the analysis. For the first time, different T quark width hypotheses are studied, from negligibly small to 30% of the new particle mass. At the 95% confidence level, the product of cross section and branching fraction is excluded above values in the range 0.26–0.04 pb for T quark masses in the range 0.7–1.7 TeV, assuming a negligible width. A similar sensitivity is observed for widths of up to 30% of the T quark mass. The production of a heavy Z' boson decaying to Tt, with T -> tZ, is also searched for, and limits on the product of cross section and branching fractions for this process are set between 0.13 and 0.06 pb for Z' boson masses in the range from 1.5 to 2.5 TeV. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000268562Publication status
publishedJournal / series
Physics letters BVolume
Pages / Article No.
Publisher
ElsevierSubject
CMS; Physics; Vector-like quarksOrganisational unit
03593 - Dissertori, Günther / Dissertori, Günther
03904 - Wallny, Rainer / Wallny, Rainer
08803 - Grab, Christoph (Tit.Prof.)
09631 - Shchutska, Lesya (ehemalig) / Shchutska, Lesya (former)
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Show all metadata
Citations
Cited 23 times in
Web of Science
Cited 23 times in
Scopus
ETH Bibliography
yes
Altmetrics